quixotic
adjective literary uk/kwɪkˈsɒt.ɪk/ us/kwɪkˈsɑː.t̬ɪk/
不切实际的，异想天开的
having or showing ideas that are different and unusual but not practical or likely to succeed
This is a vast, exciting and some say quixotic project. 这是一个宏大而激动人心的、甚至有人认为是异想天开的项目。